I think you using old release that was provided from repository which was configured wrong.
uninstall my plugin and re-install.
Don't forget refresh repository cache.
(Preference > Install/Update > Available Software Sites > eclipse-theme > [Reload])
!ENTRY org.eclipse.e4.ui.workbench 4 0 2018-06-22 11:56:39.200
!MESSAGE Unable to retrieve the bundle from the URI: bundleclass://net.jeeeyul.eclipse.themes/net.jeeeyul.eclipse.themes.e4.WidgetTracker
!ENTRY org.eclipse.e4.ui.workbench 4 0 2018-06-22 11:56:39.228
!MESSAGE Unable to retrieve the bundle from the URI: bundleclass://net.jeeeyul.eclipse.themes/net.jeeeyul.eclipse.themes.e4.ActiveThemeTracker
!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2018-06-22 11:56:42.106
!MESSAGE Project facet grails.app has not been defined. It is used in plugin com.vmware.vfabric.ide.eclipse.tcserver.core.
!ENTRY org.eclipse.jface 2 0 2018-06-22 11:56:43.344
!MESSAGE Keybinding conflicts occurred. They may